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GGBS, a by-product of steelmaking, is used as a cement replacement to reduce the carbon footprint of concrete. It is a globally traded commodity with limited availability, meeting only 10% of global cement demand. The UK imports over half of its GGBS, mainly from the EU and Japan. As global demand for low-carbon materials grows, GGBS supply may tighten, especially as exporting countries prioritise their own needs.
HTS is addressing this issue by proposing a limit on GGBS use to 25% in line with RICS guidelines, aiming for a 20% average across projects. We plan to use alternative cement replacements and advocate for demand reduction and flexible concrete specifications to manage the carbon impact of reduced GGBS availability.
Read the full approach note here.
